With the advent of mobile phones with high-quality cameras, we started making more and more pictures and videos of bright and memorable moments in our lives. Many of us have photo archives that extend back over decades and comprise thousands of pictures which makes them increasingly difficult to navigate through.

For this purpose, we at Mail.ru Computer Vision Team have created and implemented systems for smart image processing, including landmark recognition. Photos with landmarks are essential because they often capture highlights of our lives (journeys, for example). These can be pictures with some architecture or wilderness in the background. This is why we seek to locate such images using Deep Learning, and make them readily available to users.

https://medium.com/@andrei.boiarov/how-we-made-landmark-recognition-in-cloud-mail-ru-and-why-715b5f72e6d4